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Testing - Coal Proficiency Sample Preperation

The sample used is a typical South African Coal, the samples were prepared by acquiring +-75KG of material with top size of approximately 20mm. After crushing the coal to <4.75mm using a Jaw Crusher, the material was screened to remove all +-4.7mm particles. The coal was then weighted and split into two portions by means of an 8 way rotary divider, to be separately prepared for the analysis and the HGI sample.

Analysis Sample

The material was air dried in pans until visibly dry. It was then pulverised to <212um top size using an 8-inch Macsa cross beat crusher. After this, the material was screened to remove all <212 ┬Ám  and -75um material. It was then introduced into a centrically aligned mixing drum and mixed for 4 hours. After mixing the coal for 4 hours, +-600g portions were extracted periodically. Each portion was divided by means of the flattened heap-method to produce individual samples of  +-100g each. These samples were then transferred into tamper containers ready to be dispatched.    

The preparation procedure is outlined in Figure1 below.

Analysis Sample

HGI Sample

The material was dried in oven at 40 until visibly dry. After this, it was screened to remove all 2mm material. The material was then introduced into a centrically aligned mixing drum and mixed for 4 hours. After mixing the coal for 4 hours, it was divided by means of the flattened heap-method to produce individual sample of +-500g each. These samples were then sealed in plastic bags, ready to be dispatched.

The preparation procedure is outlined in Figure2 below.

HGI Sample